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Circuit Fundamentals — question 9 of 10

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You're probing a high-impedance sensor output using a standard oscilloscope probe. The sensor's Thevenin equivalent is an ideal source in series with 100kohm of source resistance. The probe is modeled as 1Mohm in parallel with 10pF. Derive the effective -3dB corner frequency of this measurement path caused by the interaction between the source resistance and the probe's capacitance, and describe what you'd actually see on screen for a fast edge from the sensor.

This one resolves to a number. Give the value in the field below and your reasoning in the box — the number is checked exactly, by arithmetic.

kHz

Units and SI prefixes are understood, including schematic notation: 4k7, 2.2 uF, 1.5e-3 A.

How sure are you?

Being confidently wrong costs more mastery than admitting a guess — that is deliberate, and it is how misconceptions get found.

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